| First Author | Stary CM | Year | 2017 |
| Journal | Mol Cell Neurosci | Volume | 82 |
| Pages | 118-125 | PubMed ID | 28522364 |
| Mgi Jnum | J:261445 | Mgi Id | MGI:6151801 |
| Doi | 10.1016/j.mcn.2017.05.004 | Citation | Stary CM, et al. (2017) Inhibition of miR-181a protects female mice from transient focal cerebral ischemia by targeting astrocyte estrogen receptor-alpha. Mol Cell Neurosci 82:118-125 |
| abstractText | Whether the effect of miR-181a is sexually dimorphic in stroke is unknown. Prior work showed protection of male mice with miR-181a inhibition. Estrogen receptor-alpha (ERalpha) is an identified target of miR181 in endometrium. Therefore we investigated the separate and joint effects of miR-181a inhibition and 17beta-estradiol (E2) replacement after ovariectomy. Adult female mice were ovariectomized and implanted with an E2- or vehicle-containing capsule for 14d prior to 1h middle cerebral artery occlusion (MCAO). Each group received either miR-181a antagomir or mismatch control by intracerebroventricular injection 24h before MCAO. After MCAO neurologic deficit and infarct volume were assessed. Primary male and female astrocyte cultures were subjected to glucose deprivation with miR-181a inhibitor or transfection control, and E2 or vehicle control, with/without ESRalpha knockdown with small interfering RNA. Cell death was assessed by propidium iodide staining, and lactate dehydrogenase assay. A miR-181a/ERalpha target site blocker (TSB), with/without miR-181a mimic, was used to confirm targeting of ERalpha by miR-181a in astrocytes. Individually, miR-181a inhibition or E2 decreased infarct volume and improved neurologic score in female mice, and protected male and female astrocyte cultures. Combined miR-181a inhibition plus E2 afforded greater protection of female mice and female astrocyte cultures, but not in male astrocyte cultures. MiR-181a inhibition only increased ERalpha levels in vivo and in female cultures, while ERalpha knockdown with siRNA increased cell death in both sexes. Treatment with ERalpha TSB was strongly protective in both sexes. In conclusion, the results of the present study suggest miR-181a inhibition enhances E2-mediated stroke protection in females in part by augmenting ERalpha production, a mechanism detected in female mice and female astrocytes. Sex differences were observed with combined miR-181a inhibition/E2 treatment, and miR-181a targeting of ERalpha. |
